Vulnerability Description
calibre is a cross-platform e-book manager for viewing, converting, editing, and cataloging e-books. Versions 9.2.1 and below contain a Path Traversal vulnerability that allows arbitrary file writes anywhere the user has write permissions. On Windows, this leads to Remote Code Execution by writing a payload to the Startup folder, which executes on next login. Function extract_pictures only checks startswith('Pictures'), and does not sanitize '..' sequences. calibre's own ZipFile.extractall() in utils/zipfile.py does sanitize '..' via _get_targetpath(), but extract_pictures() bypasses this by using manual zf.read() + open(). This issue has been fixed in version 9.3.0.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Calibre-Ebook | Calibre | < 9.3.0 |
Related Weaknesses (CWE)
References
- https://github.com/kovidgoyal/calibre/commit/e1b5f9b45a5e8fa96c136963ad9a1d35e6aPatch
- https://github.com/kovidgoyal/calibre/security/advisories/GHSA-72ch-3hqc-pgmpExploitVendor Advisory
FAQ
What is CVE-2026-26064?
CVE-2026-26064 is a vulnerability with a CVSS score of 8.8 (HIGH). calibre is a cross-platform e-book manager for viewing, converting, editing, and cataloging e-books. Versions 9.2.1 and below contain a Path Traversal vulnerability that allows arbitrary file writes a...
How severe is CVE-2026-26064?
CVE-2026-26064 has been rated HIGH with a CVSS base score of 8.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-26064?
Check the references section above for vendor advisories and patch information. Affected products include: Calibre-Ebook Calibre.